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Investment Securities - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2023
USD ($)
bond
Sep. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]                
Debt securities, available-for-sale, transfer to held-to-maturity     $ 1,990,000,000 $ 500,800,000        
Debt securities, held-to-maturity transfer, unrealized loss         $ 131,200,000      
Available-for-sale, transfer to held-to-maturity, gain (loss)         0      
Held to maturity mortgage backed securities $ 3,745,506,000       3,745,506,000     $ 3,761,094,000
Available for sale mortgage backed securities 3,890,910,000       3,890,910,000     4,331,413,000
Held-to-maturity, interest receivable 17,500,000       17,500,000      
Available-for-sale, interest receivable 18,600,000       18,600,000      
Available-for-sale securities 3,358,421,000       3,358,421,000     3,852,854,000
Securities valued at less than historical cost, amount $ 3,328,182,000       $ 3,328,182,000      
Securities valued at less than historical cost (as percent) 99.10%       99.10%      
Securities - AFS, expense         $ 10,300,000      
Securities - AFS, reversal $ 1,200,000              
Securities charged-off         $ 7,000,000      
Number of uncollectible bonds | bond         1      
Available-for-sale, net of allowance for credit losses 1,196,000       $ 1,196,000   $ 2,396,000 0
Number of nonperforming bonds | bond         2      
Securities pledged as collateral 3,380,000,000       $ 3,380,000,000     3,960,000,000
Realized gains 0 $ 8,000     0 $ 45,000    
Realized losses 0 $ 30,000     $ 391,000 $ 271,000    
Income tax benefit related to security gains (losses) (as percent)         26.135% 26.135%    
Commercial Mortgage Backed Securities                
Debt Securities, Available-for-sale [Line Items]                
Held to maturity mortgage backed securities 143,100,000       $ 143,100,000     149,200,000
Available for sale mortgage backed securities 859,900,000       859,900,000     1,070,000,000.00
Residential Mortgage Backed Securities                
Debt Securities, Available-for-sale [Line Items]                
Held to maturity mortgage backed securities 1,040,000,000.00       1,040,000,000.00     1,040,000,000.00
Available for sale mortgage backed securities $ 1,300,000,000       $ 1,300,000,000     $ 1,470,000,000